126557299944 has 96 divisors (see below), whose sum is σ = 345684568320. Its totient is φ = 41826501888.

The previous prime is 126557299927. The next prime is 126557299949. The reversal of 126557299944 is 449992755621.

126557299944 is a `hidden beast` number, since 12 + 6 + 5 + 572 + 9 + 9 + 9 + 44 = 666.

It is not an unprimeable number, because it can be changed into a prime (126557299949) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8505199 + ... + 8520065.

It is an arithmetic number, because the mean of its divisors is an integer number (3600880920).

Almost surely, 2^126557299944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 126557299944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172842284160).

126557299944 is an abundant number, since it is smaller than the sum of its proper divisors (219127268376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

126557299944 is a wasteful number, since it uses less digits than its factorization.

126557299944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15879 (or 15872 counting only the distinct ones).

The product of its digits is 48988800, while the sum is 63.

The spelling of 126557299944 in words is "one hundred twenty-six billion, five hundred fifty-seven million, two hundred ninety-nine thousand, nine hundred forty-four".